Unit 2 Matter and Chemical Change. Unit Test

Transcription

1 Unit Test Student Name Class Section 1 Properties of Matter 1. Aluminum foam is used to create lighter, safer cars. The reason that a lighter car is a safer car is because aluminum foam is A. less rigid B. much cheaper than aluminum C. unable to be dented D. able to absorb more impact energy This symbol means This symbol means A. flammable A. caution B. corrosive B. warning C. dangerously reactive C. danger D. biohazardous D. special care 4. When a substance undergoes a change of state it can use energy or give off energy. The change that occurs when a substance changes from a gas to a solid is referred to as A. fusion B. deposition C. sublimation D. condensation 5. A substance s ability to resist being scratched is the physical property of matter known as A. ductility B. malleability C. hardness D. conductivity 6. An obvious chemical property of pancakes is A. ability to combine ingredients easily B. the positive reversibility of the process C. the heat it gives off D. the new substance that appears to form 7. The difference between an element and a compound is that an element A. is a pure substance and a compound is a mixture B. has only one substance, while a compound has more than one substance C. can be made into a mixture, but a compound cannot D. Can be a pure substance, while a compound cannot be a pure substance

2 . Use the following words to complete a visual organizer, showing the relationships between and among the words provided. Use each word only once. Pure Substances, Colloids, Matter, Solutions, Compounds, Mixtures, Mechanical Mixtures, Suspensions, Elements SIA 9 - Check p A cloudy mixture in which the particles of the suspended substance are so small they cannot be easily separated out is called a A. mechanical mixture B. suspension C. colloid D. solution 10. Physical or chemical change can be identified by evidence. When a substance undergoes a chemical change the pieces of evidence used include all of the following, EXCEPT A. colour B. odour C. state D. formation of a gas 11. Freeze-drying is a technique used to preserve food for long periods of time. In the freeze-drying method the first step is to A. add hot water B. put it in a pressure chamber C. freeze the water, in the food D. refrigerate the food 12. MRE s are especially useful for astronauts, soldiers and mountain climbers. They are heated in a special package called a flameless ration heater. MRE stands for A. Military Ration Envelope B. Mission Ration Envelope C. Meal, Ready to Eat D. Meals Requiring Energy

3 Section 2 Nature of Matter Over Time Periodic Table 13. The first chemists lived before 000 B.C. Because metals had not been discovered, humans used only simple tools made from these A. rocks, scissors and paper B. wood pulp and ink C. stones and bones D. plants and animal remains 14. This is derived from khemeia (a Greek word ) A. Caustic B. Chemistry C. Copper D. Copernicus 15. alkimiya ( an Arabic word ) translates as A. Alchemy B. Alkali C. Apostle D. The Chemist 16. The scientist who developed the billiard ball model of the atom was A. Lavoisier B. Boyle C. Libeu D. Dalton 17. Most models of the atom include the sub-atomic particles, called electrons, orbiting the nucleus. The quantum model of the atom has these electrons in A. a charged cloud B. fixed orbits C. random patterns D. scattered orbits 1. This ancient element symbol means 19. This element symbol means A. copper A. oxygen B. silver B. hydrogen C. gold C. silver D. tin D. carbon 20. Demitri Mendeleev wanted to find a pattern that would allow him to predict the properties of elements not yet discovered. By using information cards he charted the pattern that seemed to work. The characteristic that showed that the properties of elements vary periodically was the A. color B. atomic number C. atomic mass D. symbol

5 Section 3 Formation of Ionic and Molecular Compounds 27. Compounds are formed when elements combine in different chemical reactions. This identifies which elements combine and how many of them are present in the compound. A. Chemical Name B. Atomic Mass Unit C. Atomic Number D. Chemical Formula 2. In the formula for baking soda [ NaHCO 3(s) ] the following indicates how many atoms are present in each molecule A. 1 sodium, 1 hydrogen, 3 carbon dioxide B. 1 atom of each element C. 1 sodium, 1 hydrogen, 1 carbon, 3 oxygen D. 1 sodium, 1 hydrogen, 1 calcium and 3 oxygen 29. In the formula for baking soda NaHCO 3(s) the (s) indicates that this molecule is A. safe B. stable C. strong D. solid 30. Pure substances formed as a result of the attraction between charged particles of opposite charges are A. Stable elements B. Ionic compounds C. Molecular compounds D. Charged elements 31. When ionic compounds are formed, the ions combine to form a A. crystal B. block C. irregular pattern D. cloud 32. When sodium (a very reactive metal) is placed in chlorine (a green gas), the sodium explodes with a bright yellow flame. As it burns, this white, coarse-grained powder is produced. A. silicon B. carbon C. alum D. salt 33. A group of ions that act as one are called A. Subatomic ions B. Polyatomic ions C. Molecular ions D. Aqueous ions 34. When naming ionic compounds there are two rules to remember: The first is that the name of the metal is always placed first, the second is the name of the non-metal ion(s) changes to. A. ous B. ade C. ide D. ate

7 Section 4 Chemical Reactions 42. A chemical reaction takes place when two or more A. molecular compound are mixed B. ionic compounds are mixed C. substances are mixed D. substances combine to form new substances 43. Use the following chemical reaction word equation to answer the question. wood + oxygen carbon dioxide + water + energy released The reactants in this chemical word equation are A. wood and oxygen B. carbon dioxide and water C. oxygen and energy D. wood and energy 44. A chemical reaction occurs when this evidence is present A. a solution is formed B. a change of state occurs C. energy is needed or released D. the reaction is reversible 45. The following word equation identifies what happens when hydrogen peroxide is left out in the sun. It changes to water and oxygen gas. A. Water + Oxygen Hydrogen peroxide B. Hydrogen peroxide + Energy Water + Oxygen C. Water + Energy + Oxygen Hydrogen peroxide D. Hydrogen peroxide + Oxygen Water + Energy 46. The reaction above is classified as A. catalytic B. exothermic C. endothermic D. oxidization 47. Fire keeps going because of three factors. These factors are A. fire - water - air B. fire - fuel - air C. fuel - air - energy D. fuel - air - heat 4. The following reaction takes place in the cells in your body. food + oxygen carbon dioxide + water + energy that is used to keep cells alive ( C 6 H 12 O 6 ) ( O 2 ) ( CO 2 ) ( H 2 O ) This word equation represents A. cellular respiration B. photosynthesis C. transpiration D. combustion

8 49. The Law of Conservation of Mass states that mass A. will be created in any chemical reaction between two or more substances B. is created but not destroyed in a chemical reaction C. is destroyed and can be recreated in an endothermic reaction D. is neither created nor destroyed in a chemical reaction 50. The only statement below that is true about a closed system compared to an open system is that A. only reactants are present in the closed system B. only products are present in the closed system C. products and reactants are trapped in a closed system D. products and reactants are free in an open system 51. There are four factors that can affect the rate of a chemical reaction. The factor below that does not belong is A. the prescence of a catalyst B. the concentration of the products C. the temperature of the reactants D. the surface area of the reactants 52. This is required by many reactions that break down food in the body, otherwise higher temperatures would be needed making it deadly for the human body.. A. enzymes B. reactants C. products D. oxygen 53. In terms of factors affecting reaction rate in a chemical reaction, only this is true about concentration the greater the concentration of the A. reactants the slower the reaction. B. products the slower the reaction. C. reactants the faster the reaction. D. products the faster the reaction. 54. In terms of factors affecting reaction rate in a chemical reaction, only this is true about temperature the more heat removed from the A. reactants the slower the reaction. B. products the slower the reaction. C. reactants the faster the reaction. D. products the faster the reaction. 55. In terms of factors that affect reaction rate in a chemical reaction, only this is true about surface area to speed up the reaction A. decrease the surface area of the products B. decrease the surface area of the reactants C. increase the surface area of the products D. increase the surface area of the reactants

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